We sure have a gorgeous weather picture in the region today thanks to some cool, dry air that has blown in from the north thanks to a broad area of high pressure centered over the western Great Lakes. If you love September weather, today is the day to get outside and enjoy as this weather is almost reminiscent of late summer or early fall with temperatures in the 70s and low humidity across the Upper Mississippi Valley. As you might expect this scenario is going to be short lived, however, as we are anticipating the arrival of a warm front from the wet in the next couple of days that will bring back some more seasonable heat and humidity, eventually pushing the mercury into the 90s once again. We’ll have sunny skies through today with a slight east breeze that will continue to draw in that dry, comfortable air for a bit longer. Changes begin to take place tonight as a couple of showers and thunderstorms will show up after midnight associated with a warm front that will eventually spread a few more thunderstorns into the area tomorrow and tomorrow night before it completely pushes through the area on Friday, bringing that summertime heat to the area. We’ll have highs in the 80s by Friday and then near 90 degree heat on Saturday before low to mid 90s become the rule for four or five days between Sunday and the middle of next week.

While we enjoy some mild temperatures today, the hottest weather is confined to the southern and southwestern U.S.

The jetstream will shift northward by Sunday, allowing intense heat to surge northward. Our highs will be in the 90s and will likely remain rather hot for several days under that ridge.